What do you think ?

So I've been across the country for about a month now ( only for vacation , comming back in the next week) without my boyfriend. 2 weeks in my vacation he started acting a bit differently. I'm 6 hours ahead of him so when he gets out of work I usually text him if he responds I'll Facetime him but he always declines or just lets it ring and says he's with one of his guy friends. After that usually doesn't message me at all anymore until like 4/5am. This always happens, if he is just out with s guy friend why can't he just answer and let me know? Never understood that but anyway Then yesterday we are on FaceTime for about 2 minutes tells me he cant FaceTime TOO LONG cause he has plans when all of a sudden he gets a call from his mother (atleast that's what he told me) immediately hangs up, says he's gonna call me right back but doesn't, couldn't even just send me a text and say he's caught up and can't call me. It was around 11pm here that we FaceTimed and he didn't get back to me until 2am saying he had to do something important. Of course I try to be understanding and not accuse him but lately it's becoming too much. What are your thoughts?